[ B- ] [ T2 ] [ T1 ] [ ID ] [ B+ ] Neg → Temp2 → Temp1 → Data → Pos (20V-21.6V)
30kΩ when cold (<0°C) → charger won’t start Hart 20v Battery Pinout Diagram
Looking at the battery from the top with the connector facing you (from left to right): [ B- ] [ T2 ] [ T1
Briefly apply 18V-20V from a known good battery directly to the internal cell group positive (bypassing the BMS for 3 seconds). This wakes the BMS. Then insert into official charger immediately. Without the ID signal, this won’t work. Without the ID signal, this won’t work
If you are repairing a Hart 20V battery, building an adapter, or troubleshooting a charger, understanding the pinout is critical. Unlike simple NiCad packs, modern lithium-ion batteries use a circuit board (BMS) to monitor temperature and voltage.
: Used by the tool or charger to identify the battery type and capacity.
: if a battery sits too long and its voltage drops too low, the charger might reject it as "dead". Using a pair of jumper wires and a healthy 20V battery, Max connected Positive to Positive Negative to Negative for just ten seconds.
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